最近提出了一种新的定量分析方法来定量天然橡胶硫化胶中的游离硫磺。这个方法是先用四氢呋喃(THF)萃取,然后,再用HPLC法来定量游离硫磺。比起亚硫酸钠法,它不需要很多的试样,灵敏度却比以前的方法高出了数百倍。另外,它只能对非键合的单体硫磺进行定量,这一点与亚硫酸钠法所定量的值有所不同。 Recently, a new quantitative method was proposed to quantify free sulfur in natural rubber vulcanizates. This method is first extracted with tetrahydrofuran (THF), and then, by HPLC method to quantify the free sulfur. It does not require as many samples as the sodium sulfite method, and its sensitivity is several hundred times higher than the previous method. In addition, it can only quantify non-bonded monomeric sulfur, which is different from the value quantified by the sodium sulfite method.